"You Still Believe in Me" is a song written by Brian Wilson and Tony Asher for American rock band the Beach Boys, released as the second track on their 1966 album Pet Sounds. The recording was produced by Wilson, who also sings lead vocal, with instrumentation that includes harpsichord, clarinet, timpani, and bicycle horn. Wilson and Asher created the song's ethereal intro by plucking a piano's strings with a bobby pin.

The song is in the key of B major, and features frequent use of the ii-V-I turnaround (six uninterrupted repeats of B-C♯m-F♯7). The chorus is composed of slash chords, such as G♯m/C♯, C♯m/B, and G♯m/F♯, resolving unusually to the vi, G major, before beginning again on B.

Brian in 1996 explained that this song is "A little 'Boys Choir'-type song with me doing the soprano. Very, very spiritual." This was the first song on Pet Sounds to which Asher wrote lyrics. It was originally titled "In My Childhood". A bicycle horn and bell acting as a remnant from the song's original childhood theme can be heard at the end of the song because they could not be edited out of the final track. Wilson has said of the song,

"You Still Believe In Me" was more of what I would call a man who would not be afraid to take all of his clothes off and sing like a girl because he had feelings for people from that perspective. I was able to close my eyes and go into a world and sing a little more effeminately and more sweet—which allows a lot more love to come down through me, you know what I mean?... It's like Kenny Rogers. There's an example of a guy who has a fairly masculine sounding voice. "You Still Believe In Me" was quite the opposite.

...
Wikipedia